kvm: Print something before calling abort() if KVM_RUN fails

It's a little unfriendly to call abort() without printing any sort of
error message. So turn the DPRINTK() into an fprintf(stderr, ...).

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

kvm-all.c

@@ -977,7 +977,8 @@ int kvm_cpu_exec(CPUState *env)
                 ret = EXCP_INTERRUPT;
                 break;
             }
-            DPRINTF("kvm run failed %s\n", strerror(-run_ret));
+            fprintf(stderr, "error: kvm run failed %s\n",
+                    strerror(-run_ret));
             abort();
         }